feat: add basic server environment api

[9aoy]

Summary

add server environment api.

type RsbuildDevServer = {
  ...
  environments: {
    [name: string]: {
      getStats: () => Promise<Stats>;
      loadBundle: <T>(entryName: string) => Promise<T>; // TODO
      getTransformedHtml: (entryName: string) => Promise<string | undefined>; // TODO
    }
  };
};

Related Links

#2713

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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